If Alexa stops working with Flair, here are a few troubleshooting steps to take.
1. The first thing to do is ask Alexa "are you okay". Alexa has the ability to check the network status herself, so she'll let you know if there is an Amazon Echo outage or if the servers are down.
2. If Alexa says everything seems to be working, try using a different skill. Ask her about the weather.
3. If Alexa says she's having a problem, if she's encircled by an orange glowing ring, or if you tried the above step to no avail, you may need to reboot your Alexa device and possibly the router.
4. If your Amazon device has a solid red ring and Alexa isn't responding at all, the mute button has been turned on. Tap the Microphone button to toggle mute on or off.